Brett was called to the NSW Bar in September 2019 and signed the Victorian Bar Roll on 14 December 2021. 

Brett was employed for 11 years as a Federal Prosecutor at the Commonwealth DPP, the last six years being at the Principal level.

Brett appears in both summary and indictable jurisdictions including summary hearings, bail applications, committals, plea hearings and in the Court of Appeal. Since being called to the Bar, he has regularly appeared in jury trials.

Immediately prior to coming to the Bar, Brett was seconded to the Australian Securities and Investments Commission (ASIC) where he worked on a matter arising from the Banking Royal Commission.

Brett is a member of the Legal Aid NSW summary and indictable crime panel.